doc/release-notes: Add waffle-next.txt

This will allow us to build up the release notes for the
next release.

A second reason for wanting to add this is to make sure that
GL is replaced with OpenGL in the release notes.

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Chad Versace <chad.versace@linux.intel.com>
pkg arch/mac: Update release tarball urls

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Chad Versace <chad.versace@linux.intel.com>
man: Update waffle website url

Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Chad Versace <chad.versace@linux.intel.com>